Patent Application
20080006671
With reference to
The piston head (10) may be circular and has a top and a connecting post (11). The connecting post (11) is formed on and protruded axially from the top of the piston head (10) and has two mounting blocks (12), an inserting recess (13) and two through holes (14).
The mounting blocks (12) may be semicircular and are formed on the top of the piston head (10), and each mounting block (12) has an inner side, an outer side, an upper edge, two indents (15) and two holding tabs (16). The inner sides of the mounting blocks ( 12) are faced to each other. The indents (15) are defined in the upper edge of the mounting block (12). The holding tabs (16) are respectively formed on and protruded out from the indents (15).
The inserting recess (13) is defined between the inner sides of the mounting blocks (12), and the holding tabs (15) extend into the inserting recess (13). The through holes (14) are formed respectively through the mounting blocks (12) from the outer side to the inner side, align with each other and communicate with the inserting recess (13).
The driving rod (20) is connected securely with the piston head (10) and has a body (21), a connecting segment (22) and a driving segment (23). The body (21) of the driving rod (20) has an upper end and a lower end.
The connecting segment (22) may be flat, is formed in the lower end of the body (20), is mounted and held in the inserting recess (13), is engaged firmly with the holding tabs (16) of the mounting blocks (12) and has an optional mounting hole (24). The mounting hole (24) is formed through the connecting segment (22) and aligns with the through holes (14) of the mounting blocks (12).
The driving segment (23) is formed on the upper end of the body (21), is used to press and shoot staples out of a staple gun.
The fastener (30) is connected with the driving rod (20) and the piston head (10). The fastener (30) is extended through the through holes (14) of the mounting blocks (12) and the mounting hole (24) of the connecting segment (22) to attach the driving rod (20) with the piston head (10).
The piston assembly as described has the following advantages.
1. The driving rod (20) is firmly connected with the piston head (10) with the holding tabs (16) engaging with the connecting segment (22) of the driving rod (20). Therefore, the piston assembly has a reinforced structural strength to bear a huge ejecting force of the staple gun and is kept from being broken down. Consequently, the useful life of the piston assembly is prolonged.
2. In addition, because the driving rod (20) is not easily broken, the internal elements of the staple gun can be kept from being damaged.
3. The piston assembly is convenient in use and decreases the economical burden of the user.
Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and features of the invention, the disclosure is illustrative only. Changes may be made in the details, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
